Process for sweating crude paraffin-wax or like mixtures (compositions) of substances which melt at different temperatures.



1). PYZBL.

PROCESS FOR SWEATING CRUDE PARAFFIN WAX 0R LIKE MIXTURES (COMPOSITIONS) 0F SUBSTANCES WHICH MELT AT DIFFERENT TEMPERATURES.

APPLICATION FILED JUNE 27, 1911.

1,040,408. Patented 001;. 8, 1912.

lLlIIflESSES lnvemnr UNITED STATES PATENT OFFICE.

DANIEL .PYZEL, OE .BALIK PAPAIl'; BORNEO, DUTCH EAST INDIA.

PROCESS FOR SWEATING CRUDE PARAEFIN-WAX 0R LIKE MIXTURES (COMPOSITIONS) OF SUBSTANCES WHICH MELT AT DIFFERENT TEMPERATURES.

Specification of Letters Patent.

Patented Oct. 8, 1912.

Application filed June 27, 1911. 7 Serial No. 635,633.

the Netherlands, have invented certain new and useful improvements in processes for sweating crude paraffin-wax or like mixtures (compositions) of substances which melt at different temperatures, of which the order to again enter the air-duct. The air- The object 0 the present inventionis toi provide a process for the continuous frac-i tional separation by sweating of crude parfollowin is-a s ecification.

atfin-wax' and like mixtures of substances having different melting points.

The most important feature of the improved process consists in this that thei sweating out process is continuous, the paraffin-wax being moved in a counter-current against a current of heated air through a sweating oven formed like a tunnel, so that;

the paraffin-wax is gradually brought to higher temperatures and during the passage of the material through the oven, as the temperature rises, the substances of low;

melting-points are first separated and then, The final,

those of higher melting-points.

melting out takes place preferably in a separate chamber.

In'the accompanying drawings: Figure is a longitudinal section of the oven; Fig. 2 is a transverse section through the delivery end of the oven, looking from the right toward the left in Fig. 1, and showing the air-heating chamber arranged over the tunnel; Fig. 3 ma transverse section on a larger scale, showing details of construction; and Fig. 4 is a detail in longitudinal elevation and on a plane at right angles to that of Fig. 3.

For carryin out the continuous sweat ng process, I emp oy an apparatus (for which I have filed application Ser. No; 635,632,

filed June 27, 1910) comprising an oven, which consists of a long passage a provided with rails on which the sweating vessels placed on trucks, or cars I) are run into the oven. The passage is closed at each end by air-locks c, d, each of which is large enough to take a sweating truck. The bot tom of the passage is made sloping, whereby the moving forward of the trucks is facilitated and the sweatin trucks have such a position that the pro uct sweatedout can immediately run 0 duct is connected at suitable places with the oven by apertures which may be closed by dampers or slides h, if, h. If the dampers are opened, a portion of the oven air flows through the damper apertures to the fan,

whereby the quantity of the air flowing through the upper cold end of the passage is diminished. In this way a slower heating may be obtained at the commencement of the sweating process. I

The air-lock all provided at the lower warm end of the passage a is provided with steam-heating coil 2', heated by live steam, in order to enable the final product of the sweating-process to be fully melted out. At the side of the passage there is provided near the rails a gutter 7a which is divided by artitions into compartments equal to the ength of a sweating truck. Each of the compartments has a discharge pi e to the outside, so that the sweating pro ucts run ning off the truck may be carried off from each truck separately. If necessary two or more drain gutters may be provided.

The sweating frames placed on the trucks are of a very simple nature, as all cocks, valves and pipes for supplying and carrying off steam, water and paraffin-wax are dispensed with. The car or truck consists of an under frame n with a number of, for instance six, columns or uprights, t, u, half of which are arranged on one side and the other half on the other side of the ear. On the uprights on one side eight pieces, 8, of U-iron are riveted for receiving the sweatin trays, while the uprights on the other si e carry corresponding angle irons which are arranged somewhat lower in order to give to sweating trays an inclined position. A discharge ipe w with a revoluble outlet nozzle m is fixed on one upright of the car or truck, by. means of which nozzle the molten products flowin from the pipe' 10 are suitably distributed into the gutters la, whereby it is possible to sweat out in the same oven simultaneously different? kinds of .the U-irons, s, of the truck and forms in this way the uppermost part of the inclined tray. .On the opposite side of the tray a drain-gutter, 'v, is arranged, the lat eral outlet pipe 00 of which is brought over a catch cup, y, of the pipeyw.

The way in which the improved process is carried out and the crude paraifin-wax introduced into the trays is as follows: The

, crude paraffin-wax is poured into the ordinary cooling trays or cooling pans, and when it has set is cut into blocks. These blocks are then placed on the gauze bottom "of the trays and pushed into the truck frame. When the truck is filled with the material, it is run into the air lock and thence into the oven passage. Here the truck enters the coldest end of the oven and gradually travels to the lower and warmest end of the oven, while the hot air flowsagainst the truck in the opposite direction.

In this way a partial melting out of the.

paraflin-wax takes place and at the upper most and less heated 'part of the oven the oils and paraflins of low melting point and I at the lowest and warmest part of the oven the paraffin-wax of higher melting point is sweated out. The trucksmust be run into the inclined passage in such a way that they stand at an inclination to the end where the collecting pipe is located. Consequently the drain gutters which serve for receiving the products dropping through the gauze bottom .into the inclined corrugated plate and running on the latter have the. same in-' clination, so that these products pass im-- mediately through the outlet pipe into the catch cups of the collecting.- pipe.- Now as the outlet nozzle m'arranged at the lowerpart of the pipe is adjusted over one of the the final product of the gutters, the molten substances flow directly out of the pipe into one of these gutters, whence they are carried off through pipes Z. When a truck has passed through the oven passage it comes into the air lock 03 where arafiin-wax is melted out by means of llVe steam. The outer door of'the air-lock is then opened,

the truck run out and the door again closed.

A sliding door located between the air lock 0 and the oven is then opened by being drawn up and the truck which stands next to the air lock runs into the latter, whereupon all the trucks contained in the 5 oven can ad- Vance one truck length. The air locks are only in communication with the external air for a short time during the opening ofthe outer doors, while the trucks are ruinin and out. The loss of heat by radiation is there:

forevery small. "The interior of the sweating oven is never in communication with the outer air as oneof the two doors of each air lock is always closed. The'fan draws the air from the air-duct and fo ces it through the heating-room into th oven- Here the hot air flows past the passage.

paraflin wax cakes trucks and causes the thereon .to sweat out.

When the air has passed through the passage it rises into theair-duct, in order to be afresh drawn up by the fan. The air is thus in continuous circulation.

In the accompanying drawings an apparatus is 'shown,'the oven of which is designed to' receive sixteen trucks. Each truck is loaded with 3.2 to 3.5 tons of crude paraflin-wax. The apparatuscan therefore, when the trucks pass through the over once every 24 hours, treat 50- tons of crude parafiin-wax per day.' Every 1 hours a sweated out truck must therefore be run out and a fresh charged truck run in. By diminishing the number of the trucks or by employing smaller trucks the oven may also be arranged for a smaller production. In

consequence of the great speed at which the hot air is blown through the tunnei', the temperature is prevented from difiering in the upper and lower parts of the same section of the tunnel, whereby the sharpness of the fractional separation is insured.

By varying the temperature and the speed of the airthe increase of temperature may be so selected from one truck to another, that the sweating process takes place under as favorable condition as possible.

h Only because in this process all the trucks may be filled at a siitable place outside the oven with the parafiin which is to be sweated out, is it possible without complicated conveying mechanisms to allow it to set in separate cooling trays or on a cooling basin instead of filling it in a moltencondition. directly into the. sweating trays and the.

solidified vparaflill to be loaded in a solid 'form on the sweating trucks, thus rendering it unnecessary to construct the sweating trays in such a way that they have to be filled with waterand molten paraffin-wax. The sweating trays may consequently be made much simpler and lighter than in prior processes. -Further the casting of the crude paraffin-wax into simple cooling trays or into masonry cooling ponds filled with water is in every respect more convenient and cheaper than pouring it directly-into the.

melting trays especially as an eflicient system of water cooling can be much-more v easily arranged in the first case.

This improved process has all the advantages of a continuous circulatory process, without having the disadvantages of intermittent operatlon.

The ra id flow of air caused bv the fan through t e sweating tunnel also diminishes the difl'erences of temperature between the upper and lower parts of the sweating frame, so that the sweating out takes place in uniform rapidity in all trays. The speed of the sweating out may also be adjusted with certainty by adjustin the fan and the air dampers. Finally as "tie sweated product is always run oif immediately, the fractional separation is substantially sharpened.

The construction of the trays and trucks also offers many advantages. The corrugated-plate gives the gauze an efiicient support, so that de ressions in the same and accumulations 0 oil produced thereby are avoided.

While I have described air as the heating fluid, obviously any other suitable heated fluid, such as steam, may be used.

I claim:

1. The process of sweatin out paratlin wax and like mixtures of su stances melting at difi'erent temperatures, which consists in moving the mass to be sweated in an opposite direction to that of a current of heated air of gradually increasing tempiarature so that fractional separation takes p ace.

2. The process of sweatin wax and like mixtures of su stances meltng at different temperatures, which consists in moving the mass to be sweated in an oposite direction to that of a current of eated air of gradually increasing temperature so that fractional separation takes place, and separately removing the separated fractions.

3. The process of sweating out paraflin' continuously moving the massto be sweat/2d in an opposite direction to that of a current of heated air of gradually increasing temperature so that fractional separation takes place.

4. The process of sweating out parafiin wax and like mixtures of substances melting at different temperatures, which consists in continuously moving the mass to be sweated in anopposite direction to that of a current of heated air of gradually increasing temperature so that fractional separation takes place, and separately removing the separated fractions.

out paraffin 5. The process of sweatin out parafiin wax and like mixtures of su stances melting at different temperatures, which consists in continuously moving the mass to be sweated in an opposite direction to that of a current of heated air of gradually increasing temperature so that fractional separation takes place, and reheating the air for further use.

6. The rocess of sweatin out paraffin wax and like mixtures of su stances melting at different temperatures, which consists in moving the mass' to be sweated through a closed chamber in an opposite directlon to that of a current of heated air of gradually increasing temperature so that fractional separation takes lace, and subjectin the wax to a final highest temperature, or the purpose described, in a separate chamber.

7. The rocess of sweat-ing out paraffin wax and 11 e mixtures of substances melting at different temperatures which consists in graduall moving a series of masses to be separate through a closed chamber in which the masses are subjected to gradually increasing temperatures.

8. The process of sweating out paraflin wax and like mixtures of substances melting at different temperatures which consists in gradually moving a series of'masses to be separated through a closed chamber in wh ch the masses are subjected to gradually 1ncreasing temperatures, and subjecting each mass to a final high temperature in a separate chamber.

9. The rocess of sweatin out paraflin wax and hkemixtures of su stances melting at difl'erent temperatures which consists in gradually moving a sums of masses to be separated through a closed chamber in which the masses are subjected to gradually increasing temperatures, produced by an oppositely flowing current of heated air.

10. The rocess of sweating out paraflin wax and hke mixtures of substances melting at different temperatures which consists in graduall moving a series of masses to be separated t rough a closed chamber in which the masses are subjected to gradually 1ncreasing temperatures produced by an op positely flowing current of heated air, and

subjecting each mass to a final high temperature in a separate chamber.

I In testimony whereof aifix my signature in presence of two wltnesses.

DANIEL PYZEL.

Witnesses: 3 G. U. ANDRIEs,

' H. G. -KNAPPERT. 

